.header{
    padding: 0 24px;
    .left{
        float: left;
    }
    .rihgt{
        float: :right;
    }
}
.main{
    
}
.footer{
    text-align: center;
    background-color: #f7f7f7;
    border-top: 1px solid #e8e8e8;
}